public byte[] EncodeMythicRSAPacket(byte[] inMessage)
{
if (inMessage.Length == 0)
{
return(null);
}
int curInPtr = 2; //Input starts at byte 3
int curOutPtr = 2; //Output starts at byte 3 too
RSAWriter writer = new RSAWriter();
writer.WriteByte(0);
writer.WriteByte(0); //add length at end
int blockLen = BLOCKLEN;
byte[] paddedBlock = new byte[200]; //normaly it s 189 byte....
int cryptedBlockLen;
while (curInPtr < inMessage.Length)
{
blockLen = BLOCKLEN;
if (curInPtr + blockLen > inMessage.Length)
{
blockLen = inMessage.Length - curInPtr;
}
//Pad a block of data
MemoryStream stream = new MemoryStream();
stream.Write(inMessage, curInPtr, blockLen);
paddedBlock = RSAPad(stream.GetBuffer());
curInPtr += blockLen;
cryptedBlockLen = paddedBlock.Length - curOutPtr - 2;
byte[] packet = RSAExptmod(paddedBlock, eRSAKeyFormat.PK_PUBLIC);
writer.WriteShort((ushort)cryptedBlockLen);
writer.Write(packet, 0, cryptedBlockLen);
curOutPtr += cryptedBlockLen + 2;
}
writer.Seek(0, SeekOrigin.Begin);
writer.WriteShort((ushort)curOutPtr);
return(writer.GetBuffer());
}
public byte[] DecodeMythicRSAPacket(byte[] inMessage)
{
if (inMessage == null)
{
return(null);
}
int curInPtr = 2;
byte[] decryptedBlock = new byte[500];
byte[] depaddedBlock = new byte[500];
RSAWriter writer = new RSAWriter();
writer.WriteByte(0);
writer.WriteByte(0); //add length at end
while (curInPtr < inMessage.Length)
{
if (curInPtr + 2 > inMessage.Length)
{
return(null);
}
int curBlockLen = (inMessage[curInPtr] << 8) + inMessage[curInPtr + 1];
curInPtr += 2;
if (curBlockLen > 0)
{
MemoryStream stream = new MemoryStream();
stream.Write(inMessage, curInPtr, curBlockLen);
decryptedBlock = RSAExptmod(stream.GetBuffer(), eRSAKeyFormat.PK_PRIVATE);
depaddedBlock = RSADepad(decryptedBlock);
writer.Write(depaddedBlock, 0, depaddedBlock.Length);
}
curInPtr += curBlockLen;
}
writer.Seek(0, SeekOrigin.Begin);
writer.WriteShort((ushort)writer.Length);
return(writer.GetBuffer());
}
public byte[] DecodeMythicRSAPacket(byte[]inMessage)
{
if(inMessage==null) return null;
int curInPtr = 2;
byte[]decryptedBlock = new byte[500];
byte[]depaddedBlock = new byte[500];
RSAWriter writer = new RSAWriter();
writer.WriteByte(0);
writer.WriteByte(0);//add length at end
while(curInPtr < inMessage.Length)
{
if(curInPtr+2 > inMessage.Length)
return null;
int curBlockLen = (inMessage[curInPtr]<<8)+inMessage[curInPtr+1];
curInPtr+=2;
if(curBlockLen>0)
{
MemoryStream stream = new MemoryStream();
stream.Write(inMessage,curInPtr,curBlockLen);
decryptedBlock = RSAExptmod( stream.GetBuffer(),eRSAKeyFormat.PK_PRIVATE);
depaddedBlock = RSADepad(decryptedBlock);
writer.Write(depaddedBlock,0,depaddedBlock.Length);
}
curInPtr+=curBlockLen;
}
writer.Seek(0, SeekOrigin.Begin);
writer.WriteShort((ushort)writer.Length);
return writer.GetBuffer();
}
public byte[] EncodeMythicRSAPacket(byte[] inMessage)
{
if(inMessage.Length==0) return null;
int curInPtr = 2; //Input starts at byte 3
int curOutPtr = 2; //Output starts at byte 3 too
RSAWriter writer = new RSAWriter();
writer.WriteByte(0);
writer.WriteByte(0);//add length at end
int blockLen = BLOCKLEN;
byte[] paddedBlock = new byte[200];//normaly it s 189 byte....
int cryptedBlockLen;
while(curInPtr < inMessage.Length)
{
blockLen = BLOCKLEN;
if(curInPtr+blockLen > inMessage.Length)
blockLen = inMessage.Length - curInPtr;
//Pad a block of data
MemoryStream stream = new MemoryStream();
stream.Write(inMessage,curInPtr,blockLen);
paddedBlock =RSAPad(stream.GetBuffer());
curInPtr += blockLen;
cryptedBlockLen = paddedBlock.Length - curOutPtr - 2;
byte[] packet = RSAExptmod( paddedBlock,eRSAKeyFormat.PK_PUBLIC);
writer.WriteShort((ushort)cryptedBlockLen);
writer.Write( packet,0,cryptedBlockLen);
curOutPtr += cryptedBlockLen + 2;
}
writer.Seek(0, SeekOrigin.Begin);
writer.WriteShort((ushort)curOutPtr);
return writer.GetBuffer();
}
